<template>
  <div class="article-container">
    <van-nav-bar
      class="page-nav-bar"
      title="黑马头条"
    >
      <van-icon
        slot="left"
        name="arrow-left"
        size="18"
        class="van-nav-bar__title"
        @click="$router.back()"
      />
    </van-nav-bar>

    <div class="main-wrap">
      <div class="loading-wrap" v-if="isShowLoading">
        <van-loading
          color="#3296fa"
          vertical
        >加载中</van-loading>
      </div>

      <div class="article-detail" v-else-if="article.aut_name">
        <h1 class="article-title">{{ article.title }}</h1>

        <van-cell class="user-info" center :border="false">
          <van-image
            class="avatar"
            slot="icon"
            round
            fit="cover"
            :src="article.aut_photo"
          />
          <div slot="title" class="user-name">{{ article.aut_name }}</div>
          <div slot="label" class="publish-date">{{ article.pubdate | dateFilter }}</div>

          <follow-user
            v-model="article.is_followed"
            :aut-id="article.aut_id"
          />
        </van-cell>

        <div ref="articleContent" class="article-content markdown-body" v-html="article.content"></div>

        <van-divider>正文结束</van-divider>

        <article-comment
          :art-id="article.art_id"
          @update-count="totalCount = $event"
          :list="commentList"
          @click-reply2="clickReply2"
        />

      </div>

      <div class="error-wrap" v-else-if="errorState === 404">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>

      <div class="error-wrap" v-else>
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button class="retry-btn" @click="loadArtcileInfo">点击重试</van-button>
      </div>
    </div>

    <div class="article-bottom" v-if="article.art_id">
      <van-button
        class="comment-btn"
        type="default"
        round
        size="small"
        @click="isPostShow = !isPostShow"
      >写评论</van-button>

      <van-icon
        name="comment-o"
        :badge="totalCount"
        color="#777"
      />

      <collect-article
        v-model="article.is_collected"
        :autId="article.art_id"
      />

      <like-article
        v-model="article.like_count"
        :autId="article.art_id"
      />

      <van-icon name="share" color="#777777"></van-icon>
    </div>

    <van-popup
      v-model="isPostShow"
      position="bottom"
    >
      <comment-post
        @onpost-success="updateComment"
      />
    </van-popup>

    <van-popup
      v-model="isReplyShow"
      position="bottom"
      :style="{height: '95%'}"
    >
      <comment-reply
        v-if="isReplyShow"
        :comment="currentComment"
        @close-reply="isReplyShow = false"
      />
    </van-popup>
  </div>
</template>

<script>
import { getArticleById } from '@/api/article'
import { ImagePreview } from 'vant'
import './github-markdown.css'
import FollowUser from '@/components/follow-user.vue'
import CollectArticle from '@/components/collect-article.vue'
import LikeArticle from '@/components/like-article.vue'
import ArticleComment from './components/article-comment.vue'
import CommentPost from './components/comment-post'
import CommentReply from './components/comment-reply'

export default {
  name: 'article-index',
  components: {
    FollowUser,
    CollectArticle,
    LikeArticle,
    ArticleComment,
    CommentPost,
    CommentReply
  },
  props: {
    articleId: {
      type: [Number, String],
      required: true
    }
  },
  // provide: {
  //   articleId: this.articleId
  // },

  provide: function() {
    return {
      articleId: this.articleId
    }
  },
  data () {
    return {
      article: {},
      isShowLoading: true,
      errorState: '',
      isBtnLoadingShow: false,
      totalCount: 0,
      isPostShow: false,
      commentList: [],
      isReplyShow: false,
      currentComment: {}
    }
  },
  mounted () {
    this.loadArtcileInfo()
  },
  methods: {
    async loadArtcileInfo () {
      this.isShowLoading = true

      try {
        const { data: { data } } = await getArticleById(this.articleId)

        // if(Math.random() > 0.5) {
        //   JSON.parse('qwer')
        // }

        this.article = data

        setTimeout(() => {
          this.previweImg(this.$refs.articleContent)
        })

      } catch (err) {
        if (err.response && err.response.status === 404) {
          this.errorState = 404
        }
      }

      this.isShowLoading = false
    },
    previweImg (content) {
      let arr = content.querySelectorAll('img')

      let images = []
      arr.forEach((item, index) => {
        images.push(item.src)

        item.onclick = function() {
          ImagePreview({
            images,
            startPosition: index,
            closeable: true
          })
        }
      })
    },
    updateComment (res) {
      this.commentList.unshift(res.data.data.new_obj)
      this.isPostShow = false
    },
    clickReply2(item) {
      this.currentComment = item

      this.isReplyShow = true
    }
  }
}
</script>

<style scoped lang="less">
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>
